CN101090239A - Compensation circuit and method for power converter - Google Patents
Compensation circuit and method for power converter Download PDFInfo
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- CN101090239A CN101090239A CNA2007101037179A CN200710103717A CN101090239A CN 101090239 A CN101090239 A CN 101090239A CN A2007101037179 A CNA2007101037179 A CN A2007101037179A CN 200710103717 A CN200710103717 A CN 200710103717A CN 101090239 A CN101090239 A CN 101090239A
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- 238000000034 method Methods 0.000 title claims description 25
- 238000007600 charging Methods 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims description 96
- 230000008878 coupling Effects 0.000 abstract description 17
- 238000010168 coupling process Methods 0.000 abstract description 17
- 238000005859 coupling reaction Methods 0.000 abstract description 17
- 239000003990 capacitor Substances 0.000 abstract description 9
- 238000004804 winding Methods 0.000 description 14
- 230000010355 oscillation Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013507 mapping Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a floating drive circuit, which comprises an input circuit, a floating driving circuit and a control circuit, wherein the input circuit is used for receiving an input signal; a latch circuit receives a trigger signal to generate a latch signal for switching a switch; a coupling capacitor coupled between the input circuit and the latch circuit for generating a trigger signal according to the input signal; a diode is coupled between a voltage source and a floating supply terminal of the latch circuit for charging a capacitor, the capacitor is coupled between the floating supply terminal and a floating ground terminal of the latch circuit for providing a supply voltage to the latch circuit, and the input signal controls the latch circuit through the coupling capacitor.
Description
Technical field:
The invention relates to a kind of power supply changeover device, it refers to a kind of switch type power converter especially.
Background technology:
General power supply changeover device is the control mode control and adjustment power output with power switched.See also Fig. 1, it is the circuit diagram of a current-mode power supply changeover device of known techniques.As shown in the figure, it comprises a control circuit 20, is used for according to a back coupling signal V
FBSwitch signal S and produce one at an output OUT
wTo adjust the output of power supply changeover device.Switch signal S
wDrive a power electric crystal 12 and switch a transformer 10.Generally speaking, back coupling signal V
FBBe via an optical coupler or have the output voltage V of the feedback circuit detecting power supply changeover device of an auxiliary winding (figure does not show)
0, and feedback end FB acquisition at one of control circuit 20.The voltage of auxiliary winding is the output voltage V according to power supply changeover device
0And changing, so back coupling signal V
FBBe that output voltage according to power supply changeover device produces.Therefore, back coupling signal V
FBBe according to output voltage V
0Produce.One of transformer 10 first side winding N
pBe to receive an input voltage V
IN, secondary side winding N
sIn order to send output voltage V
0
One rectifier 14 couples secondary side winding N
s, a filter capacitor 16 couples rectifier 14 and secondary side winding N
s, a resistance R
SSeries connection power electric crystal 12 switches electric current I with one of foundation transformer 10
PProduce a current signal V
I, that is to say current signal V
ICan represent switch current I
POne current sense end VI received current signal V of control circuit 20
ITo form a current circuit with as Controlled in Current Mode and Based.
See also Fig. 2, it is the circuit diagram of control circuit of the power supply changeover device of known techniques.As shown in the figure, control circuit 20 comprises that an oscillating circuit 25 and switches circuit 30.Commutation circuit 30 comprises one first comparator 32, one second comparator 33, a flip-flop 36 and two and lock 38,39, switches signal Sw to produce.Oscillating circuit 25 produces an oscillation signal IPS, and is sent to a clock pulse input CK of flip-flop 36, switches signal S with activation
w, an output Q of flip-flop 36 couples and an input of lock 39, and another input of lock 39 receives oscillation signal IPS.First comparator, 32 received current signal V
IWith a maximum threshold value V
LIMIT, to compare current signal V
IWith maximum threshold value V
LIMITSecond comparator, 33 received current signal VI and back coupling signal V
FB, second comparator 33 utilizes current signal V
IRelatively feedback signal V
FBTo adjust the output of power supply changeover device.If current signal V
IGreater than maximum threshold value V
LIMIT, control circuit 20 sees through and lock 38 switches signal S with forbidden energy
wAnd the restriction peak power output, the function of restriction power output is generally to be used as protective circuit overload or short circuit.
See also Fig. 3, it is the oscillogram of the power supply changeover device of known techniques.As shown in the figure, it shows the running of feedback loop and electric current restriction.Switch current I among the figure
PExpression current signal V
IAs current signal V
ILess than maximum threshold value V
LIMITThe time, switch signal S
wWith negative feedback signal V
FBControl.As current signal V
IGreater than maximum threshold value V
LIMITThe time, switch signal S
wCan be subject to maximum threshold value V
LIMITIn development in science and technology now, existing many correlation techniques are suggested, with the technology of control and the protection of carrying out the current-mode power supply changeover device effectively.At this wherein, United States Patent (USP) the 5th, 903, No. 452 " Adaptive slope compensator for current mode powerconverters " be to disclose relevant slope-compensation technology, United States Patent (USP) the 6th, 611, No. 439 " PWM controller for controlling output power limit ofa power supply " and United States Patent (USP) the 6th, 674, No. 656 " PWMcontroller having a saw limiter for output power limitwithout sensing input voltage ", be to disclose two kinds of compensation techniques to export with power-limiting.Yet above-mentioned known techniques has the not good problem of compensation accuracy, and the slope-compensation meeting influences the compensation effect of defencive function.Therefore, main purpose of the present invention is to solve the aforesaid drawbacks, and proposes easy compensating circuit to reduce the cost of power supply changeover device.
Summary of the invention:
Main purpose of the present invention, be to provide a kind of compensating circuit and method of power supply changeover device, it produces one first compensating signature and one second compensating signature to adjust current signal by a signal generating circuit, and by the power output of first compensating signature restriction power supply changeover device, second compensating signature is reached slope-compensation, to reach the purpose of accuracy compensation.
Secondary objective of the present invention is to provide a kind of compensating circuit and method of power supply changeover device, and its circuit is simple and easy, to reach the purpose of the cost that reduces power supply changeover device.
The compensating circuit of power supply changeover device of the present invention and method are used for the power supply changeover device of Control current pattern, and it comprises that a current sensing circuit switches electric current according to one of a power supply changeover device and produces a current signal; One switches circuit received current signal and feedbacks signal and produces a switching signal, with power controlling electric crystal and the output of adjusting power supply changeover device; One signal generating circuit produces one first compensating signature and one second compensating signature to compensate, and first compensating signature is adjusted the output of current signal with the restriction power supply changeover device, and second compensating signature is adjusted current signal to carry out slope-compensation.
Moreover an oscillating circuit produces an oscillation signal, switches signal and compensating signature in order to produce.First compensating signature is adjusted current signal and is produced one first signal with the restriction switch current, and when the power electric crystal conducting, the slope of first compensating signature successively decreases.Second compensating signature is adjusted current signal to produce one second signal, and the slope of second compensating signature increases progressively according to the power electric crystal conducting, and second signal more is sent to the feedback loop of power supply changeover device.First compensating signature and the second compensating signature bias value (offset) level off to zero.
The invention has the beneficial effects as follows: the compensating circuit of related power supply changeover device and method, it comprises current sensing circuit and signal generating circuit.Current sensing circuit produces current signal according to switch current, signal generating circuit produces one first compensating signature and one second compensating signature adjusting current signal, thereby reaches the power output restriction compensation and the slope-compensation of power supply changeover device respectively.
Description of drawings:
Fig. 1 is the circuit diagram of power supply changeover device of the current-mode of known techniques;
Fig. 2 is the circuit diagram of control circuit of the power supply changeover device of known techniques;
Fig. 3 is the oscillogram of the power supply changeover device of known techniques;
Fig. 4 is the circuit diagram of the current-mode power supply changeover device of a preferred embodiment of the present invention;
Fig. 5 is the circuit diagram of the control circuit of a preferred embodiment of the present invention;
Fig. 6 is the circuit diagram of the oscillating circuit of a preferred embodiment of the present invention;
Fig. 7 is the circuit diagram of the signal generating circuit of a preferred embodiment of the present invention;
Fig. 8 is the oscillogram of compensating signature of the signal generating circuit of a preferred embodiment of the present invention.
The figure number explanation:
10 transformers, 12 power electric crystals
14 rectifiers, 16 filter capacitors
100 oscillating circuits, 105 current sources
110 electric crystals, 111 electric crystals
113 electric crystals, 115 switches
120 electric crystals, 121 electric crystals
123 electric crystals, 125 switches
130 electric capacity, 150 comparators
151 comparators, 155 and not b gates
156 and not b gates, 158 inverters
159 inverters, 20 control circuits
25 oscillating circuits, 200 signal generating circuits
210 inverters, 211 electric crystals
212 electric crystals, 215 switches
220 electric capacity, 230 operational amplifiers
231 resistance, 232 electric crystals
235 electric crystals, 236 electric crystals
240 operational amplifiers, 241 resistance
242 electric crystals, 245 electric crystals
246 electric crystals, 247 electric crystals
250 first signal generators, 270 second signal generators
32 first comparators, 33 second comparators
36 flip-flop 38 and locks
39 and lock 40 transformers
42 power electric crystals, 44 rectifiers
46 filter capacitors, 50 control circuits
60 commutation circuits, 62 first comparators
63 second comparator 65 and locks
70 flip-flop 75 and locks
80 impedance means, 90 impedance means
V
FBBack coupling signal V
INInput voltage
V
ICurrent signal VI current sense end
V
OOutput voltage V
1First signal
V
2The second signal V
CCSupply voltage
V
LIMITMaximum threshold value N
pFirst side winding
N
SSecondary side winding IPS oscillation signal
I
pSwitch current I
RReference current
I
0Electric current I
1First compensating signature
I
2The second compensating signature I
113Electric current
I
121Electric current I
212Electric current
I
232Electric current I
242Electric current
FB feedbacks end OUT output
S
wSwitch signal R
sResistance
The CK clock pulse input R end of resetting
D input Q output
RST
1The first replacement signal RST
2The second replacement signal
RAMP slope signal V
HThe high levle threshold value
V
LLow level threshold value V
RReference voltage
V
wThe waveform signal
Embodiment:
Further understand and understanding for the juror is had architectural feature of the present invention and the effect reached, sincerely help with preferred embodiment and cooperate detailed explanation, illustrate as after:
See also Fig. 4, it is the circuit diagram of the current-mode power supply changeover device of a preferred embodiment of the present invention.As shown in the figure, power supply changeover device comprises a transformer 40, a power electric crystal 42, a rectifier 44, a filter capacitor 46, a control circuit 50 and a resistance R
STransformer 40 comprises a first side winding N
PWith a secondary side winding N
SFirst side winding N
PReceive an input voltage V
IN, first side winding N
PMore couple power electric crystal 42, power electric crystal 42 is in order to switching transformer 40.Resistance R
SAs a current sensing circuit and couple power electric crystal 42, switch electric current I according to one of the transformer 40 of flowing through
PProduce a current signal V
I, switch current I
PFlow through resistance R through power electric crystal 42
S
Consult Fig. 4 again, control circuit 50 comprises a current sense end VI, a back coupling end FB and an output OUT, switches signal S in order to produce one
wAnd the output of adjustment power supply changeover device.Current sense end VI and back coupling end FB are difference received current sensing signal V
IWith a back coupling signal V
FB, produce back coupling signal V according to the output of power supply changeover device
FB, in order to reach the purpose that back coupling is adjusted.Output OUT is according to current signal V
IWith back coupling signal V
FBProduce and switch signal S
WOne rectifier 44 couples the secondary side winding N of transformer 40
S, a filter capacitor 46 couples rectifier 44 and secondary side winding N
S
See also Fig. 5, it is the circuit diagram of the control circuit of a preferred embodiment of the present invention.As shown in the figure, control circuit 50 comprises that one switches circuit 60, two impedance means 80,90, an oscillating circuit 100 and signal generating circuits 200.Signal generating circuit 200 forms compensating circuit with impedance means 80,90, to produce one first compensating signature and one second compensating signature.Moreover, resistance R as shown in Figure 4
SBe the some of compensating circuit, current sensing circuit is according to the switch current I of power electric crystal 42
PAnd in resistance R
SProduce current signal V
IOscillating circuit 100 produces an oscillation signal IPS, a reference current I
RAnd a slope signal RAMP, and be sent to commutation circuit 60 and signal generating circuit 200 respectively.Commutation circuit 60 comprises a flip-flop 70, one first comparator 62, one second comparator 63 and two and lock 65,75, switches signal S to produce
W, switch signal S
WAccording to oscillation signal IPS and back coupling signal V
FBIn order to power controlling electric crystal 42 transformer 40 shown in Figure 4, to adjust the output of power supply changeover device with switching.
Consult Fig. 5 again, signal generating circuit 200 is according to slope signal RAMP and switching signal S
WProduce one first compensating signature I
1With one second compensating signature I
2, the first compensating signature I
1With the second compensating signature I
2Be sent to impedance means 80,90 respectively, to adjust current signal V
ISecond comparator 63 is through impedance means 90 received current signal V
I, and first comparator 62 is through impedance means 80 received current signal V
IImpedance means 80 is associating first compensating signature I
1With current signal V
IProduce one first signal V
1, i.e. the first compensating signature I
1Adjustable current signal V
IAnd produce the first signal V
1Impedance means 90 is associating second compensating signature I
2With current signal V
IProduce one second signal V
2, i.e. the second compensating signature I
2Adjustable current signal V
IAnd produce the second signal V
2
As shown in Figure 5, an input D of flip-flop 70 receives supply voltage V
CC, an input that reaches lock 75 couples the output Q of flip-flop 70, switches signal S to produce at an output that reaches lock 75
W, and another input of lock 75 receives oscillation signal IPS with control switching signal S
WMaximal duty cycle, the clock pulse input CK of flip-flop 70 receives oscillation signal IPS, switches signal S in order to conducting
W, and see through and lock 65 control switching signal S
WEnd.An output that reaches lock 65 couples a replacement end R of flip-flop 70, and the input that reaches lock 65 couples the output of first comparator 62 and second comparator 63 respectively, to receive one first replacement signal RST
1And one second replacement signal RST
2
Accept above-mentionedly, an output of second comparator 63 produces the second replacement signal RST
2, the input of second comparator 63 receives back coupling signal V respectively
FBWith the second signal V
2Back coupling signal V
FBBe that the output that is coupled to power supply changeover device is adjusted to reach to feedback.One output of first comparator 62 produces the first replacement signal RST
1, the input of first comparator 62 receives maximum threshold value V respectively
LIMITWith the first signal V
1Maximum threshold value V
LIMITBe a fixed value, to limit threshold value (current limitthreshold) as an electric current.The second compensating signature I2 adjusts current signal V
IAnd produce the second signal V
2, be the feedback loop of stabilized power supply transducer in order to reach slope-compensation.The first compensating signature I
1Adjust current signal V
IAnd produce the first signal V
1, be power output restriction in order to the offset supply transducer.That is to say the first compensating signature I
1Adjust current signal V
ITo limit switch current I more accurately
P, the peak power output of power supply changeover device can keep a fixed value, with the input voltage V corresponding to power supply changeover device
INVariation.
See also Fig. 6, it is the circuit diagram of the oscillating circuit of a preferred embodiment of the present invention.As shown in the figure, oscillating circuit 50 comprises that a current source 105 is coupled to supply voltage V
CC, and couple a current mirroring circuit to produce reference current I
R, a charging current I
113With a discharging current I
123Current mirroring circuit comprises a plurality of electric crystals 110,111,113,120,121 and 123, the source electrode of electric crystal 120,121,123 all is coupled to earth terminal, and the gate of electric crystal 120,121,123, the drain of electric crystal 120 all are coupled in current source 105.The drain of electric crystal 123 produces discharging current I according to the electric current of current source 105
123The source electrode of electric crystal 110,111,113 all couples supply voltage V
CC, the gate of electric crystal 110,111,113 couples mutually with the drain of electric crystal 110, and the drain of electric crystal 110 more couples the drain of electric crystal 121 to receive an electric current I
121, the drain of electric crystal 111,113 produces reference current I respectively
RWith charging current I
113, reference current I
RBe sent to signal generating circuit 200 (as Fig. 6 and shown in Figure 7), charging current I
113Flow through a switch 115 so that an electric capacity 130 is charged.Discharging current I
123Flow through a switch 125 so that electric capacity 130 is discharged, so can produce a slope signal RAMP at electric capacity 130.
Consult Fig. 6 again, comparator 150,151, and not b gate 155,156 and an inverter 158 are in order to producing oscillation signal IPS with control switch 115, and oscillation signal IPS more can be via inverter 159 in order to control switch 125.Slope signal RAMP and oscillation signal IPS are sent to signal generating circuit 200 and commutation circuit 60 (as shown in Figure 5) more respectively.Comparator 150 receives a high levle threshold value (high thresholdvoltage) V
HWith slope signal RAMP, to compare slope signal RAMP and high levle threshold value V
HComparator 151 receives a low level threshold value (low thresholdvoltage) V
LWith slope signal RAMP, to compare slope signal RAMP and low level threshold value V
LOne input of and not b gate 155 couples an output of comparator 150, one input of and not b gate 156 couples an output of comparator 151, another input of and not b gate 156 couples an output of and not b gate 155, one output of and not b gate 156 couples another input of and not b gate 155, one output of and not b gate 155 couples an input of inverter 158, one output of inverter 158 produces oscillation signal IPS, the output of inverter 158 more couples an input of an inverter 159, and the anti-phase oscillation signal IPS of output output of inverter 159 is used for control switch 125.
See also Fig. 7, it is the circuit diagram of the signal generating circuit of a preferred embodiment of the present invention.As shown in the figure, signal generating circuit 200 comprises one first signal generator 250 and one second signal generator 270.Second signal generator 270 couples oscillating circuit 100, produces the second compensating signature I according to slope signal RAMP
2, first signal generator 250 couples commutation circuit 60, produces the first compensating signature I1 according to switching signal SW.Second signal generator 270 comprises an operational amplifier 240, a plurality of electric crystal 242,245,246,247 and a resistance 241.One input of operational amplifier 240 receives slope signal RAMP, another input of operational amplifier 240 couples the source electrode of electric crystal 242, one output of operational amplifier 240 couples the gate of electric crystal 242, resistance 241 is coupled between the source electrode and earth terminal of electric crystal 242, and the drain of electric crystal 242 produces an electric current I 242 according to slope signal RAMP.Electric crystal 245,246 forms a current mirroring circuit with received current I
242And produce the second compensating signature I
2, the source electrode of electric crystal 245,246 all couples supply voltage V
CC, the gate of electric crystal 245,246 couples mutually with the drain of electric crystal 245, and the drain of electric crystal 245 more couples the drain of electric crystal 242 with received current I
242, the drain of electric crystal 246 is according to electric current I
242Produce the second compensating signature I
2
Consult Fig. 7 again, operational amplifier 240, electric crystal 242 and resistance 241 are formed a voltage is changeed current converter (voltage-to-current converter), receives slope signal RAMP by electric crystal 245,246 and produces the second compensating signature I
2Electric crystal 247 is to be used for according to switching signal S
WCut-off state and by electric crystal 245,246, the source electrode of electric crystal 247, drain and gate couple respectively supplies voltage V
CC, electric crystal 245,246 gate with switch signal S
WBecause slope signal RAMP is according to switching signal S
WConducting state and increase by the second compensating signature I
2With the second signal V
2When power electric crystal 42 conductings, increase to one second accurate position from one first accurate position in during one-period.
As shown in Figure 7, first signal generator 250 comprises the current mirroring circuit with electric crystal 211,212, the source electrode of electric crystal 211,212 all is coupled to earth terminal, the gate of electric crystal 211,212 couples mutually with the drain of electric crystal 211, and the drain of electric crystal 211 receives the reference current I of oscillating circuit 100
RAnd produce electric current I at the drain of electric crystal 212
212Electric current I
212As a discharge circuit with to an electric capacity 220 discharge and produce a waveform signal V
WBecause electric current I
212Be according to reference current I
RMapping produces, and slope signal RAMP is that foundation is by reference current I
RThe electric current I that mapping is produced
113Charging and produce (as shown in Figure 6), so waveform signal V
WDischarge rate be to close to be connected in advancing the speed of slope signal RAMP.One switch 215 is as a charging circuit, and switch 215 is coupled to a reference voltage V
RAnd between the electric capacity 220, reference voltage V
RBe to electric capacity 220 chargings, to switch signal S through switch 215
WBe to see through an inverter 210 and control switch 215, so when switching signal S
WDuring conducting, 220 of electric capacity discharge.
Another voltage changes current converter and comprises an operational amplifier 230, an electric crystal 232 and a resistance 231, sees through electric crystal 235,236 to receive waveform signal V
WAnd produce the first compensating signature I
1One input of operational amplifier 230 receives waveform signal V
W, another input of operational amplifier 230 couples the source electrode of electric crystal 232, and an output of operational amplifier 230 couples the gate of electric crystal 232, and resistance 231 is coupled between the source electrode and earth terminal of electric crystal 232, and the drain of electric crystal 232 is according to waveform signal V
WProduce electric current I 232.Electric crystal 235,236 forms a current mirroring circuit, with received current I
232And produce the first compensating signature I
1, the source electrode of electric crystal 235,236 all couples supply voltage V
CC, the gate of electric crystal 235,236 couples mutually with the drain of electric crystal 235, and the drain of electric crystal 235 more couples the drain of electric crystal 232 with received current I
232, the drain of electric crystal 236 is according to electric current I
232Produce the first compensating signature I
1When power electric crystal 42 conductings, the first compensating signature I
1With the first signal V
1Be to be reduced to one second amplitude from one first amplitude, the first signal V in during one-period
1The switch current I that is used for power-limiting electric crystal 42
P
See also Fig. 8, it is the oscillogram of compensating signature of the signal generating circuit of a preferred embodiment of the present invention.As shown in the figure, the second compensating signature I
2Advance the speed and be same as the first compensating signature I
1Minimizing speed, the therefore first compensating signature I
1With the second compensating signature I
2Bias value level off to zero, make the current signal V that flows through
IThe variation of electric current I 0 (as shown in Figure 5) remain a fixed value, so can finish slope-compensation and Power Limitation compensation by a ball bearing made using, and slope-compensation can not interfere with each other the compensation effect that promptly can reach high precision like this with the Power Limitation compensation.
In sum, the compensating circuit of power supply changeover device of the present invention and method, it comprises current sensing circuit and signal generating circuit.Current sensing circuit produces current signal according to switch current, signal generating circuit produces one first compensating signature and one second compensating signature adjusting current signal, and reaches the power output restriction compensation and the slope-compensation of power supply changeover device respectively.
The above, it only is a preferred embodiment of the present invention, be not to be used for limiting scope of the invention process, all equalizations of doing according to the described shape of claim scope of the present invention, structure, feature and spirit change and modify, and all should be included in the claim scope of the present invention.
Claims (19)
1, a kind of compensating circuit of power supply changeover device is characterized in that, it comprises:
One current sensing circuit switches electric current according to one of a power electric crystal and produces a current signal; And
One signal generating circuit produces one first compensating signature and one second compensating signature, to adjust this current signal;
Wherein, this first compensating signature is adjusted this current signal, and to limit the power output of this power supply changeover device, this second compensating signature is adjusted this current signal with slope-compensation.
2, compensating circuit as claimed in claim 1 is characterized in that, this signal generating circuit produces this first compensating signature and this second compensating signature according to this switching signal, and wherein this switching signal is controlled this power electric crystal.
3, compensating circuit as claimed in claim 1, it is characterized in that, this first compensating signature is adjusted this current signal and is produced one first signal to limit this switch current, and when this power electric crystal conducting, this first compensating signature is reduced to one second amplitude by one first amplitude in during one-period.
4, compensating circuit as claimed in claim 1, it is characterized in that, this second compensating signature is adjusted this current signal and is produced one second signal, and transfer to a feedback loop of this power supply changeover device, when this power electric crystal conducting, this second signal increases to one second accurate position by one first accurate position in during one-period.
5, compensating circuit as claimed in claim 1 is characterized in that, the bias value of this first compensating signature and this second compensating signature levels off to zero.
6, compensating circuit as claimed in claim 1 is characterized in that, signal generating circuit more comprises:
One first signal generator couples one of this power supply unit and switches circuit, produces this first compensating signature to switch signal according to one of this commutation circuit, and wherein this switching signal is controlled this power electric crystal; And
One second signal generator couples an oscillating circuit of this power supply changeover device, produces this second compensating signature with the slope signal according to this oscillating circuit.
7, a kind of compensating circuit is characterized in that to control a power supply changeover device, and it comprises:
One current sensing circuit switches electric current according to one of a power electric crystal of this power supply changeover device and produces a current signal; And
One signal generating circuit produces one first compensating signature, to adjust this current signal;
Wherein, this signal generating circuit is adjusted this current signal, to limit this switch current of this power electric crystal.
8, compensating circuit as claimed in claim 7 is characterized in that, when this power electric crystal conducting, this first compensating signature is reduced to one second amplitude by one first amplitude in during one-period.
9, compensating circuit as claimed in claim 7 is characterized in that, this signal generating circuit more produces one second compensating signature, adjusts this current signal with this power supply changeover device of slope-compensation.
10, compensating circuit as claimed in claim 9 is characterized in that, the bias value of this first compensating signature and this second compensating signature levels off to zero.
11, compensating circuit as claimed in claim 7 is characterized in that, this signal generating circuit more comprises:
One electric capacity produces a waveform signal;
One charging circuit, according to this power electric crystal by and this electric capacity is charged;
One discharge circuit discharges to this electric capacity according to this power electric crystal conducting;
Wherein, this signal generating circuit produces this first compensating signature according to this waveform signal.
12, a kind of compensation method is characterized in that to control a power supply changeover device, and its step comprises:
Use a current sensing circuit, switch electric current according to one of a power electric crystal of this power supply changeover device and produce a current signal: and
Use a signal generating circuit, produce one first compensating signature and adjust this current signal to limit a power output of this power supply changeover device.
13, compensation method as claimed in claim 12 is characterized in that, it more comprises:
Produce a switching signal and control this power electric crystal, and produce this first compensating signature according to this switching signal.
14, compensation method as claimed in claim 12 is characterized in that, when this power electric crystal conducting, this first compensating signature is reduced to one second amplitude by one first amplitude in during one-period.
15, compensation method as claimed in claim 12 is characterized in that, it more comprises:
Use this signal generating circuit, produce one second compensating signature and adjust this current signal with this power supply changeover device of slope-compensation.
16, compensation method as claimed in claim 15 is characterized in that, when this power electric crystal conducting, this second signal increases to one second accurate position by one first accurate position in during one-period.
17, compensation method as claimed in claim 15 is characterized in that, the bias value of this first compensating signature and this second compensating signature levels off to zero.
18, compensation method as claimed in claim 15 is characterized in that, more comprises:
Produce a switching signal and control this power electric crystal, and produce this second compensating signature according to this switching signal.
19, compensation method as claimed in claim 12 is characterized in that, produces the step of this first compensating signature, more comprises:
Produce a waveform signal according to this power electric crystal conducting; And
Produce this first compensating signature according to this waveform signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/638,479 US8089791B2 (en) | 2006-12-14 | 2006-12-14 | Compensation circuit and compensation method for current mode power converters |
| US11/638,479 | 2006-12-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101090239A true CN101090239A (en) | 2007-12-19 |
| CN101090239B CN101090239B (en) | 2014-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710103717.9A Active CN101090239B (en) | 2006-12-14 | 2007-05-16 | Compensation circuit and method for power converter |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8089791B2 (en) |
| CN (1) | CN101090239B (en) |
| TW (1) | TWI347728B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683898A (en) * | 2012-10-01 | 2014-03-26 | 崇贸科技股份有限公司 | Primary side regulation control circuit of power converter |
| CN103825432A (en) * | 2012-11-15 | 2014-05-28 | 快捷半导体(苏州)有限公司 | Driver circuit, system and method for driving semiconductor device |
| TWI450070B (en) * | 2010-09-07 | 2014-08-21 | System General Corp | Method and apparatus for a flyback power converter providing output voltage and current regulation without input capacitor |
| CN103683898B (en) * | 2012-10-01 | 2016-11-30 | 崇贸科技股份有限公司 | Primary side regulation control circuit of power converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7800927B2 (en) * | 2006-12-14 | 2010-09-21 | System General Corp. | Method and circuit for providing compensations of current mode power converters |
| US7936087B2 (en) * | 2007-03-12 | 2011-05-03 | System General Corp. | Switching controller for parallel power converters |
| US8081495B2 (en) * | 2008-11-20 | 2011-12-20 | Semiconductor Components Industries, Llc | Over power compensation in switched mode power supplies |
| TWI374602B (en) * | 2008-12-29 | 2012-10-11 | Richtek Technology Corp | Power supply control circuit and method for sensing voltage in the power supply control circuit |
| TWI427884B (en) * | 2010-05-18 | 2014-02-21 | Leadtrend Tech Corp | Control methods, power control methods, power supplies, controllers and power supply controllers |
| TWI450065B (en) * | 2011-03-03 | 2014-08-21 | Pacifictech Microelectronics Co Ltd | DC to DC current mirror switching regulator |
| US20130070483A1 (en) | 2011-09-20 | 2013-03-21 | Yu-Yun Huang | Controlling Method, Power Supply, Power Controller, and Power Controlling Method |
| US8817802B2 (en) * | 2011-12-21 | 2014-08-26 | Comtech Ef Data Corp. | Method and system for providing hitless switching while maintaining a power equivalent bandwidth (PEB) ratio using multiple carriers |
| TWI646766B (en) * | 2018-01-15 | 2019-01-01 | 晶豪科技股份有限公司 | Oscillator and associated direct current-to-direct current converter applying the oscillator |
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| US5335162A (en) * | 1993-01-15 | 1994-08-02 | Toko America, Inc. | Primary side controller for regulated power converters |
| US5929620A (en) * | 1996-11-07 | 1999-07-27 | Linear Technology Corporation | Switching regulators having a synchronizable oscillator frequency with constant ramp amplitude |
| US5859768A (en) * | 1997-06-04 | 1999-01-12 | Motorola, Inc. | Power conversion integrated circuit and method for programming |
| US6201714B1 (en) * | 1999-11-09 | 2001-03-13 | Skynet Electronics Co., Ltd. | Exchanging converter having a zero-voltage switching control circuit for driving an output voltage filter capacitor to partially feed back storage energy to an input side of the transformer or storage inductor |
| US6839247B1 (en) * | 2003-07-10 | 2005-01-04 | System General Corp. | PFC-PWM controller having a power saving means |
| US7425819B2 (en) * | 2005-06-16 | 2008-09-16 | Microsemi Corporation | Slope compensation circuit |
| US7388764B2 (en) * | 2005-06-16 | 2008-06-17 | Active-Semi International, Inc. | Primary side constant output current controller |
| US7378822B2 (en) * | 2005-11-17 | 2008-05-27 | Linear Technology Corporation | Switching regulator slope compensation generator circuit |
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2006
- 2006-12-14 US US11/638,479 patent/US8089791B2/en active Active
-
2007
- 2007-05-04 TW TW096115852A patent/TWI347728B/en active
- 2007-05-16 CN CN200710103717.9A patent/CN101090239B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI450070B (en) * | 2010-09-07 | 2014-08-21 | System General Corp | Method and apparatus for a flyback power converter providing output voltage and current regulation without input capacitor |
| CN103683898A (en) * | 2012-10-01 | 2014-03-26 | 崇贸科技股份有限公司 | Primary side regulation control circuit of power converter |
| CN103683898B (en) * | 2012-10-01 | 2016-11-30 | 崇贸科技股份有限公司 | Primary side regulation control circuit of power converter |
| CN103825432A (en) * | 2012-11-15 | 2014-05-28 | 快捷半导体(苏州)有限公司 | Driver circuit, system and method for driving semiconductor device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101090239B (en) | 2014-09-24 |
| US20080144343A1 (en) | 2008-06-19 |
| US8089791B2 (en) | 2012-01-03 |
| TW200826438A (en) | 2008-06-16 |
| TWI347728B (en) | 2011-08-21 |
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